cocos2d-x 利用CCLabelTTF制作文字描边与阴影效果的实现方法

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
USING_NS_CC;
using namespace std;

class HelloWorld : public CCLayer
{
public:
    virtual bool init();
    static CCScene* scene();
    CREATE_FUNC(HelloWorld);
    
    
    //给文字添加描边
    CCLabelTTF* textAddStroke(const char* string, const char* fontName, float fontSize,const ccColor3B &color3,float lineWidth);
    
    //添加阴影
    CCLabelTTF* textAddShadow(const char* string, const char* fontName, float fontSize,const ccColor3B &color3,float shadowSize,float shadowOpacity);
    
    //既添加描边又添加阴影
    CCLabelTTF* textAddOutlineAndShadow(const char* string, const char* fontName, float fontSize,const ccColor3B &color3,float lineWidth,float shadowSize,float shadowOpacity);
    
};

#endif // __HELLOWORLD_SCENE_H__

#include "HelloWorldScene.h"
#include "SimpleAudioEngine.h"

using namespace cocos2d;
using namespace CocosDenshion;

CCScene* HelloWorld::scene()
{
    CCScene *scene = CCScene::create();
    HelloWorld *layer = HelloWorld::create();
    scene->addChild(layer);
    return scene;
}
bool HelloWorld::init()
{
    if ( !CCLayer::init() )
    {
        return false;
    }

    
    CCSize size = CCDirector::sharedDirector()->getWinSize();
    
    //创建个背景
    CCLayerColor* whiteLayer = CCLayerColor::create(ccc4(0, 205, 205, 255), size.width, size.height);
    this->addChild(whiteLayer);
    
    //创建描边
    CCLabelTTF* outline = textAddStroke("描边 Stroke", "Arial", 40, ccWHITE, 1);
    outline->setPosition(ccp(size.width*0.5, size.height*0.7));
    this->addChild(outline);
    
    //创建阴影
    CCLabelTTF* shadow = textAddShadow("阴影 Shadow", "Arial", 40, ccWHITE, 2, 200);
    shadow->setPosition(ccp(size.width*0.5, size.height*0.5));
    this->addChild(shadow);
    
    //创建描边加阴影
    CCLabelTTF* outlineShadow = textAddOutlineAndShadow("描边加阴影 OutlineShadow", "Arial", 40, ccWHITE, 1, 4, 200);
    outlineShadow->setPosition(ccp(size.width*0.5, size.height*0.3));
    this->addChild(outlineShadow);
    
    return true;
}

/*
 制作文字描边效果是很简单的，我们写好一段文字之后，也就是创建出一个CCLabelTTF，称之为正文CCLabelTTF。然后再创建出4个CCLabelTTF，颜色为黑色，大小同正文CCLabelTTF相同，
 称之为描边CCLabelTTF。说到这大家可能已经明白了，没错，就是把4个描边CCLabelTTF放于正文CCLabelTTF的下面，分别于左右上下与正文CCLabelTTF错开，这样描边效果就实现啦。。
 
 *string     文本
 *fontName   文本字体类型
 *fontSize   文本大小
 *color3     文本颜色
 *lineWidth  所描边的宽度
 */
CCLabelTTF* HelloWorld::textAddStroke(const char* string, const char* fontName, float fontSize,const ccColor3B &color3,float lineWidth)
{
    //正文CCLabelTTF
    CCLabelTTF* center = CCLabelTTF::create(string, fontName, fontSize);
    center->setColor(color3);
    
    //描边CCLabelTTF 上
    CCLabelTTF* up = CCLabelTTF::create(string, fontName, fontSize);
    up->setColor(ccBLACK);
    up->setPosition(ccp(center->getContentSize().width*0.5, center->getContentSize().height*0.5+lineWidth));
    center->addChild(up,-1);

    //描边CCLabelTTF 下
    CCLabelTTF* down = CCLabelTTF::create(string, fontName, fontSize);
    down->setColor(ccBLACK);
    down->setPosition(ccp(center->getContentSize().width*0.5, center->getContentSize().height*0.5-lineWidth));
    center->addChild(down,-1);
    
    //描边CCLabelTTF 左
    CCLabelTTF* left = CCLabelTTF::create(string, fontName, fontSize);
    left->setPosition(ccp(center->getContentSize().width*0.5-lineWidth, center->getContentSize().height*0.5));
    left->setColor(ccBLACK);
    center->addChild(left,-1);
    
    //描边CCLabelTTF 右
    CCLabelTTF* right = CCLabelTTF::create(string, fontName, fontSize);
    right->setColor(ccBLACK);
    right->setPosition(ccp(center->getContentSize().width*0.5+lineWidth,center->getContentSize().height*0.5));
    center->addChild(right,-1);
    
    return center;
}


/*
 给文字添加阴影，一看就懂的。。。
 *string         文本
 *fontName       文本字体类型
 *fontSize       文本大小
 *color3         文本颜色
 *shadowSize     阴影大小
 *shadowOpacity  阴影透明度
 */
CCLabelTTF* HelloWorld::textAddShadow(const char* string, const char* fontName, float fontSize,const ccColor3B &color3,float shadowSize,float shadowOpacity)
{
    CCLabelTTF* shadow = CCLabelTTF::create(string, fontName, fontSize);
    shadow->setColor(ccBLACK);
    shadow->setOpacity(shadowOpacity);
    
    CCLabelTTF* center = CCLabelTTF::create(string, fontName, fontSize);
    center->setColor(color3);
    center->setPosition(ccp(shadow->getContentSize().width*0.5-shadowSize, shadow->getContentSize().height*0.5+shadowSize));
    shadow->addChild(center);
    
    return shadow;
}


//既添加描边又添加阴影
CCLabelTTF* HelloWorld::textAddOutlineAndShadow(const char* string, const char* fontName, float fontSize,const ccColor3B &color3,float lineWidth,float shadowSize,float shadowOpacity)
{
    CCLabelTTF* center = textAddStroke(string, fontName, fontSize, color3, lineWidth);
    
    CCLabelTTF* shadow = CCLabelTTF::create(string, fontName, fontSize);
    shadow->setPosition(ccp(center->getContentSize().width*0.5+shadowSize, center->getContentSize().height*0.5-shadowSize));
    shadow->setColor(ccBLACK);
    shadow->setOpacity(shadowOpacity);
    center->addChild(shadow,-1);
    
    return center;
}